package cn.xwlin.util;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public class SpringContextUtil implements ApplicationContextAware {
  /**
   * spring上下文环境
   */
  private static ApplicationContext applicationContext;

  // 下面的这个方法上加了@Override注解，原因是继承ApplicationContextAware接口是必须实现的方法
  @Override
  public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    SpringContextUtil.applicationContext = applicationContext;
  }

  public static ApplicationContext getApplicationContext() {
    return applicationContext;
  }

  public static Object getBean(String name) throws BeansException {
    return applicationContext.getBean(name);
  }

  public static <T> T getBean(Class<T> clazz) throws BeansException {
    return applicationContext.getBean(clazz);
  }

  public static Object getBean(String name, Class<?> requiredType) throws BeansException {
    return applicationContext.getBean(name, requiredType);
  }

  public static boolean containsBean(String name) {
    return applicationContext.containsBean(name);
  }

  public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
    return applicationContext.isSingleton(name);
  }

  public static Class<?> getType(String name) throws NoSuchBeanDefinitionException {
    return applicationContext.getType(name);
  }

  public static String[] getAliases(String name) throws NoSuchBeanDefinitionException {
    return applicationContext.getAliases(name);
  }
}
